diff --git a/Gemfile.lock b/Gemfile.lock
index 5476619..36cf42f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -89,7 +89,7 @@ GEM
       activesupport (>= 3.1)
     parallel (1.11.2)
     public_suffix (2.0.5)
-    rack (2.0.7)
+    rack (2.2.3)
     rack-livereload (0.3.16)
       rack
     rb-fsevent (0.9.8)